September weather forecast
San Francisco Lempa, El Salvador

September, the first month of the autumn in San Francisco Lempa, is still a tropical month, with temperature in the range of an average high of 30.9°C (87.6°F) and an average low of 20.5°C (68.9°F).

Temperature

San Francisco Lempa, El Salvador, greets September with an average high-temperature of a still tropical 30.9°C (87.6°F), marking a slight deviation from the preceding month. San Francisco Lempa in September experiences a low-temperature average of 20.5°C (68.9°F).

Heat index

The heat index value during September is appraised at a blisteringly hot 41°C (105.8°F). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The average relative humidity in September in San Francisco Lempa, El Salvador, is 82%.

Rainfall

In San Francisco Lempa, El Salvador, in September, it is raining for 27.5 days, with typically 134mm (5.28") of accumulated precipitation. In San Francisco Lempa, El Salvador, during the entire year, the rain falls for 192.2 days and collects up to 1062mm (41.81") of precipitation.

Daylight

In September, the average length of the day is 12h and 12min.
On the first day of the month, sunrise is at 05:44 and sunset at 18:07. On the last day of September, sunrise is at 05:45 and sunset at 17:46 CST.

Sunshine

In San Francisco Lempa, El Salvador, the average sunshine in September is 8.8h.

UV index

The months with the lowest UV index are January, June through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 6 suggests this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.